샌드위치 판재의 차량적용 기술개발

이명호(MEUNG-HO RHEE),유용문(YONG-MUN RYU),이경남(KYUNG-NAM LEE),김종하(JONG-HA KIM),이중윤(JOONG-YOON LEE),금영탁(YOUNG-TAG KEUM) 한국소성가공학회 1998 박판성형 심포지엄 Vol.1998 No.2

샌드위치 판재의 차량적용 기술개발

이명호(Meung-Ho Rhee),유용문(Yong-Mun Ryu),윤의박(Eui-Park Yoon),이경남(Kyung-Nam Lee),이중윤(Joong-Yoon Lee),금영탁(Young-Tag Keum) 한국소성·가공학회 1998 소성가공 : 한국소성가공학회지 Vol.7 No.6

부여나성 동나성 2문지 발굴조사의 의의

심상육 ( Sang Yuck Shim ),이명호 ( Meung Ho Lee ),김태익 ( Tae Ik Kim ),김선옥 ( Sunok Kim ) 공주대학교 백제문화연구소 2014 백제문화 Vol.1 No.51

사비도성은 백제 후기의 수도로 고구려의 도성과 마찬가지로 커다란 背後산성(청마산성)이 결합된 구조이며, 그 외측으로는 大小의 산성이 환상으로 배치되어 도성의 방어력을 높이고 있다. 그리고 도성은 內城外郭으로 구성되어 최후 방어선으로 부여나성이 구축되어 있다. 이 부여나성은 사비도성의 외곽 성벽만을 지칭하는 용어로 지금까지 20여 차례의 조사를 통하여 동나성과 북나성의 6.6㎞의 성벽선을 확인하였으며, 토축부와 석축부로 구축된 내탁식의 석축성임과 동시에 사비 천도 전에 사비도성의 계획하에 완성된 성벽임이 밝혀지고 있다. 금번 동나성 2문지의 발굴조사는 지금까지의 부여나성의 조사현황을 소개하고 이를 통해 확인된 성벽선·지형별 축조기법·구간별 축조·기저부의 조성·토축부의 특징·성벽의 개보수·성벽의 축조시기와 부여나성의 문지 등을 일괄한 후 2문지의 발굴조사 내용을 수록하였다. 사비도성의 내외부 통로인 동나성 2문지는 산지의 교통로 상에 위치한 성문으로 성외부에서는 문의 유무를 가늠할 수 없는 숨긴문이며, 개구부 두 성벽이 어긋난 어긋문 형식이다. 이 문지는 도성의 배후산성인 청마산성을 잇는 최단거리의 교통로상에 위치한 문지로 두 차례에 걸쳐 성문이 개변된 것으로 확인되었으며, 개구부는 너비 7~15m에 이르는 평면 사다리꼴을 띠고 북측부는 구조물이 놓여 성벽과 마찬가지로 내외를 차폐하는 역할을 하였고, 남편은 계단상의 통로로 활용하였음이 밝혀졌다. 즉, 일반적인 성문은 개구부가 통로임에 비하여 2문지는 개구부의 폭도 넓을 뿐만 아니라 개구부에 통로 이외에 다른 시설물이 설치된 것으로 일반적인 성문과는 상당히 이질적인 문지 형태이다. 그리고 2차문지의 구지표에 가까운 폐기층에서 백제시대 사비기에 해당하는 유물만이 출토되어 성문의 운용은 백제 사비기에만 이루어졌음을 확인할 수 있었다. The Sabi capital is the late one of the Baekje Dynasty and it shows the structure same as the Goguryeo capital connected with the large rear fortress such as Cheongma Mountain Fortress. On the extended line, small and large mountain fortresses are arranged as a ring shape and they are raising the defence of the capital. Moreover, the capital is composed of internal donjon and external fortresses and was built Buyeo Naseong fortress up as the final line of defence. This Buyeo Naseong fortress is a term indicating only outer rampart and it was identified 6.6 kilometers of fortress wall lines on the eastern and northern Naseong fortresses through around 20 surveys until now. In addition, it is revealing that it was a stone built-up fortress where comprises earthen and stone structures and at the same time it was constructed by the master plan of the Sabi capital prior to the transfer of the capital. This time the estimate report on the eastern part of the remains of gate 2 introduces the survey status of the Buyeo Naseong Fortress and summarizes Fortress lines identified through this, structure methods in terrain, construction in sectors, the building of foundation, special features of earthen part, the improvement and repair of ramparts, the construction date of ramparts and the gate remains of the Buyeo Naseong Fortress; in addition, it mentioned the contents of excavation survey on the remains of gate 2. The remains of gate 2 in the eastern part for internal and external passages of the Sabi capital are a sort of fortress gate located on a line of communication; in addition, they are a hidden gate that cannot see them from outside and a deviation door type that goes crisscross two ramparts of the entrance. These gate remains are on the shortest traffic route of the capital connected with the rear fortress, Cheongma Mountain Fortress; they were confirmed that the fortress gate was improved twice; moreover, the entrance is 7-15 meters in width and shows a flat echelon formation; it revealed that the northern part had certain structures and they played a role to cover inside and outside; furthermore, the southern part was employed for the route for staircases. In brief, fortress gates in general have entrances for routes; by contrast, the gate 2 remains have a quite wide entrance and they were installed different facilities saved routes; they illustrate quite distinguished gate remains compared with other general fortress gates. Moreover, the destruction layer near the old surface of the earth in the gate 2 remains only revealed objects in the Sabi period of the Baekje Dynasty. As a result of this, it can confirm that the management of fortress gate merely had done in the Sabi Baekje period.

마찰손실 저감을 위한 Laser Surface Texturing의 패턴에 관한 연구

박종혁(Jong-Hyuck Park),민준원(Joon-Won Min),정우영(Woo-Young Chung),이명호(Meung-Ho Lee),이은길(Eun-Gil Lee),추인길(In-Gil Choo) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5

Although laser texturing technology is known for effective method to improve the tribological performance of friction surface for years, new applications are reported. Up to date, laser texturing approaches found in the literature are mainly discussed about the dimple shape cases or its friction effect problems. However, for industrial applications, the LST pattern on lubricating surface conditions was investigated in this study. Tribological experiments were conducted with the CrN coated SAE 9254 steel patterned for dot and line marking. Marking laser with a scanner were used for the laser texturing process. In addition, LST was applied to the Piston top ring and tribological experiments were compared.

여러 형태의 홈을 가지고 있는 알루미늄 압출튜브의 에너지 흡수성능의 향상

이재용,오재응,이성학,이명호,한창수 대한금속재료학회(대한금속학회) 1997 대한금속·재료학회지 Vol.35 No.12

The energy absorption performance of extruded aluminum tube specimens for space frame was evaluated using computer-simulated compressive tests and quasi-static compressive deformation tests. Experimental deformation test and its simulation were conducted for seven extruded tube specimens on which various types of grooves were introduced, and the test data were investigated via observation of deformation mode, maximum resistant force, and absorbed energy. The results indicated that the computer simulation data correlated well with the compressive deformation behavior, indicating that the simulation was very useful for evaluation of the absorption energy performance. When the grooves were introduced at the folding sites pre-estimated by the computer simulation, the energy absorption performance could be improved, and the half-grooved specimens absorbed more effectively than the full-grooved specimens. On the other hand, when the grooves of the same interval were introduced without consideration of the folding sites, unhomogeneous deformation, together with bending, occurred, and deteriorated the energy absorption performance because energies were not as effectively absorbed as on folding.

용탕단조법으로 제조된 Al-Ni 복합재료 피스톤링의 파괴기구

이성학,추성훈,이명호 대한금속재료학회(대한금속학회) 1997 대한금속·재료학회지 Vol.35 No.1

The main objective of this study is to investigate the effect of microstructure on the fracture behavior in two Al-Ni composite piston rings fabricated by squeeze casting method. Microstructural observation and insitu SEM fracture test were conducted on the composites to identify the microfracture processes. Detailed microstructural analyses showed that the reinforcing Ni contained an amount of Ni₃Al and NiAl phases near the Ni/Al interfacial region, which enhance the overall hardness of the composites. It was also found from in-situ observations of crack initiation and propagation that the interfacial debonding occurred at the Ni/Al interface in the early loading stage, providing an easy crack propagation path. In order to improve mechanical properties of the composite piston rings, thus, the improvement of interfacial properties by applying a new coating method is suggested.

Space Frame 용 알루미늄 압출튜브의 충돌흡수에너지 평가

김동국,이성학,이명호,김승보 대한금속재료학회(대한금속학회) 1997 대한금속·재료학회지 Vol.35 No.2

The compressive deformation behavior under dynamic loading was investigated using a high performance servo-hydraulic machine in order to evaluate experimentally impact absorption energies of extruded aluminum tubing for space frame. Dynamic compression tests were conducted for three extruded aluminum tubing whose thicknesses were 1.5 ㎜, 2.0 ㎜, and 3.0 ㎜, and then the test data were compared via observation of deformation mode. The results indicated that the dynamic deformation behavior correlated well with load-displacement curve data, i.e., the number of peaks formed by the compression-resistant force matched with the number of plastic hinges formed during compression. In the tubing with thickness of 3.0 ㎜, the number of plastic hinges decreased, and bending occurred seriously. This leaded to drop in impact absorption energies per unit cross-sectional area since energies could not be absorbed effectively upon bending. These findings suggested that in order to improve impact absorption energies of the extruded aluminum tubing for space frame, their thickness less than 3.0 ㎜ and the design of their cross-section for promoting folding instead of bending were recommended.